The AEM 21-819 Performance Cold Air Intake System replaces both the left and right side housings. This air intake was designed to fit some Infinity Q50 and Q60 models. Both banks uses an oval shaped AEM Dry flow Air Filter. The filter media is made from a synthetic fiber that does not require oiling. The filter also provides excellent filtration and has great air flow. Maintenance is easy since the filter can be used up to 100, 000 miles before cleaning is needed (depending on driving conditions). Individual heatshields keep out engine bay heat . The factory MAF sensor mounts directly on the supplied intake tube. The air intake system it is backed by AEM's Lifetime Limited . Some AEM air intakes are not legal for sale or use in California and other states adopting California emission standards, while others are 50 state legal. View the 21-819 vehicle applications to determine the legal status for each vehicle.